To quote from Vijay of Techworm (linked at the top of this article): "Sony PlayStation 4 Hack Allegedly Allows Users To Play Pirated Games And Go Online Without PS Plus

Reports and rumours indicate that Lizard Squad have allegedly managed to make a PlayStation 4 jailbreak and they are going to release the same to all users in 2015.

Kdramastars (kdramastars.com/articles/69884/20150122/ps4-jailbreak-hack.htm) states that Lizard Squad have allegedly successfully jailbroken the PlayStation 4 and now are going to go public with the same.

The base of the rumour is that during the Lizard Squads DDoSing of Xbox Live and PS4 in Chritsmas holidays, Cyberland said that the Lizard Squad hacker group was reportedly able to find a security flaw in the latest 2.03...

65w ago - Following up on the recent PS4 Factory Service Mode and PS4 Jailbreak rumors, today German PlayStation 4 hacker SKFU Tweeted that an alleged PS4 vulnerability has been detected with hopes that an exploit has been found.

While there currently isn't much more than a single Tweet by SKFU on this rumored PS4 vulnerability, according to him testing is indeed underway. We will update this article if/when new information surfaces, and below is the actual Tweet for those interested: